Code-Snippets-Functions/Execute a function on a child site/WooCommerce/change-all-archive-pages-to-display-30-products.txt

add_action('pre_get_posts','wc_woocommerce_archive');

function wctt_woocommerce_archive($query) {
  if (!is_admin() && $query->is_main_query() && is_shop() || is_woocommerce() || is_product_category() || is_product_tag()) {
        $query->set( 'posts_per_page', '30' );
  }
}